一种新型假定病原体的分子表征,Streptococcus nakanoensis sp. Nov.,从唾液培养物中分离出来
Takeaki Wajima1, Takashi Sugawara2, Emi Tanaka1
1Department of Microbiology, Faculty of Pharmacy, Meijo University, Nagoya, Japan.
Microbiology spectrum
|September 13, 2024
概括
一种新型的诺抗性α-血溶性链球菌菌株MTG105被确定为一种新物种Streptococcus nakanoensis. 这种从肺炎患者的唾液中分离出来的致病细菌表现出类似于Streptococcus pneumoniae的毒性.
科学领域:
- 微生物学 微生物学
- 基因组学就是基因组学.
- 病变的发生和发病.
背景情况:
- 链球菌属包括60多种物种,越来越多的报道显示,通过基因组分析确定了新的α-hemolytic链球菌物种.
- 有限的数据存在于新发现的链球菌物种的致病性,除了链球菌肺炎和链球菌伪肺炎.
研究的目的:
- 从肺炎患者中分离出一种抗诺隆的α-溶血性链球菌株MTG105的特征.
- 为了确定菌株MTG105.5的遗传关系和病原性潜力.
主要方法:
- 使用BLAST进行全基因组测序,包括数字DNA-DNA杂交和平均核酸标识 (ANI).
- 使用器官型肺组织模型进行感染检测.
- 生物化学表征和光素敏感性测试.
主要成果:
- 基因组分析确定MTG105是一种新物种,与Streptococcus pseudopneumoniae密切相关,并提出命名Streptococcus nakanoensis sp. 新型 (类型菌株MTG 105T).
- 尽管MTG105携带了两个肺聚氨酸基因拷贝,但对光素敏感.
- 在肺模型中,MTG105诱导了类似于S. pneumoniae和S. pseudopneumoniae的上皮损伤,表明了潜在的病原性.
结论:
- 对Streptococcus nakanoensis的鉴定突出了新型,潜在的毒性和多药耐药性Streptococcus物种的出现.
- 持续监测具有毒性和/或多药耐药性的新物种至关重要,因为自然转化促进了Streptococcus中的基因交换.
- 在S. nakanoensis的独特的遗传和生化特征需要谨慎的诊断方法.
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